SECURITIES (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities:
Amortized Cost	$ 448,219	$ 363,366
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	3,740	3,890
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(4,461)	(3,612)
Fair Value	447,498	363,644
Held-to-maturity Securities:
Amortized Cost	497,688	487,076
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2,429	3,556
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(5,923)	(4,982)
Fair Value	494,194	485,650
Available-for-sale Securities and Held-to-maturity Securities:
Amortized Cost	945,907	850,442
Gross Unrealized Gains	6,169	7,446
Gross Unrealized Losses	(10,384)	(8,594)
Fair Value	941,692	849,294
U.S. Government agency securities
Available-for-sale Securities:
Amortized Cost	35,475	24,006
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	86	238
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(131)	0
Fair Value	35,430	24,244
U.S. treasury securities [Member]
Held-to-maturity Securities:
Amortized Cost	1,006	1,007
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	29	47
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fair Value	1,035	1,054
Agency mortgage-backed securities [Member]
Available-for-sale Securities:
Amortized Cost	214,934	173,268
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,897	2,852
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1,067)	(736)
Fair Value	215,764	175,384
Held-to-maturity Securities:
Amortized Cost	204,768	156,088
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	1,791	2,274
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(736)	(858)
Fair Value	205,823	157,504
Agency collateralized mortgage obligations [Member]
Available-for-sale Securities:
Amortized Cost	124,098	101,094
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	78	106
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2,164)	(1,332)
Fair Value	122,012	99,868
Held-to-maturity Securities:
Amortized Cost	262,998	297,445
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	397	1,002
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(4,987)	(3,797)
Fair Value	258,408	294,650
State, county, and municipal securities [Member]
Available-for-sale Securities:
Amortized Cost	2,237	3,743
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	37	50
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	2,274	3,793
Single issuer trust preferred securities issued by banks [Member]
Available-for-sale Securities:
Amortized Cost	2,012	2,311
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	4	3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	(3)
Fair Value	2,016	2,311
Held-to-maturity Securities:
Amortized Cost	1,500	1,500
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	29	44
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fair Value	1,529	1,544
Pooled trust preferred securities issued by banks and insurers
Available-for-sale Securities:
Amortized Cost	2,179	2,200
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(539)	(616)
Fair Value	1,640	1,584
Small Business Administration Pooled Securities [Member]
Available-for-sale Securities:
Amortized Cost	47,852	37,561
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	44	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(118)	(372)
Fair Value	47,778	37,189
Held-to-maturity Securities:
Amortized Cost	27,416	31,036
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	183	189
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(200)	(327)
Fair Value	27,399	30,898
Marketable securities [Member]
Available-for-sale Securities:
Amortized Cost	19,432	19,183
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,594	641
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(442)	(553)
Fair Value	$ 20,584	$ 19,271